74ACT16821

Supply voltage range, V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.5 V to 7 V
Input voltage range, V_I (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .0.5 V to VCC + 0.5 V
Output voltage range, V_O (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .0.5 V to VCC + 0.5 V
Input clamp current, I_IK (V_I < 0 or VI > V_CC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . .±20 mA
Output clamp current, I_OK (V_O < 0 or V_O > V_CC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±50 mA
Continuous output current, I_O (V_O = 0 to V_CC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±50 mA
Continuous current through V_CC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±500 mA
Maximum package power dissipation at TA = 55°C (in still air) (see Note 2): DL package . . . . . . . . . . .1.4 W
Storage temperature range, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .65°C to 150°C

These 20-bit flip-flops feature 3-state outputs designed specifically for driving highly-capacitive or relatively low-impedance loads. They are particularly suitable for implementing wider buffer registers, I/O ports, parity bus interfacing, and working registers.

The 74ACT16821 can be used as two 10-bit flip-flops or one 20-bit flip-flop. On the positive transition of the clock (CLK) input, the Q outputs follow the data (D) inputs. Each 10-bit flip-flop section has a buffered output-enable (1OE or 2OE) input that can be used to place the ten outputs in either a normal logic state (high or low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly.

OE does not affect the internal operation of the flip-flops. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.

The 74ACT16821 is packaged in theTI shrink small-outline package, which provides twice the I/O pin count and functionality of standard small-outline packages in the same printed-circuit-board area.

The 74ACT16821 is characterized for operation over the full military temperature range of 55°C to 125°C. The 74ACT16821 is characterized for operation from 40°C to 85°C.